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Clay Refractories, Vandalia, Missouri. NPDES permit MO0000710 expired Mar 31, 2024; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Sulfate [as S] | daily maximum | report only (mg/L) | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 80 mg/L | all year | 001 |
| Oil and grease [soxhlet extr.] tot. | daily maximum | ≤ 15 mg/L | all year | 001 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Aluminum, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Chromium, trivalent total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Chloride | daily maximum | report only (mg/L) | all year | 001 |
| Rainfall | daily maximum | report only (in) | all year | 001 |
| Chemical oxygen demand [COD] | daily maximum | report only (mg/L) | all year | 001 |
| Storm water flow | daily maximum | report only (MGD) | all year | 001 |
| Chlorides + Sulfates | daily maximum | report only (mg/L) | all year | 001 |
| Sulfate [as S] | daily maximum | report only (mg/L) | all year | 002 |
| pH | minimum | ≥ 6.5 SU | all year | 002 |
| pH | maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 002 |
| Oil and grease [soxhlet extr.] tot. | daily maximum | report only (mg/L) | all year | 002 |
| Aluminum, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Chromium, trivalent total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Chloride | daily maximum | report only (mg/L) | all year | 002 |
| Rainfall | daily maximum | report only (in) | all year | 002 |
| Chemical oxygen demand [COD] | daily maximum | report only (mg/L) | all year | 002 |
| Storm water flow | daily maximum | report only (MGD) | all year | 002 |
| Chlorides + Sulfates | daily maximum | report only (mg/L) | all year | 002 |
| Sulfate [as S] | daily maximum | report only (mg/L) | all year | 003 |
| pH | minimum | ≥ 6.5 SU | all year | 003 |
| pH | maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 003 |
| Oil and grease [soxhlet extr.] tot. | daily maximum | report only (mg/L) | all year | 003 |
| Aluminum, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Rainfall | daily maximum | report only (in) | all year | 003 |
| Chemical oxygen demand [COD] | daily maximum | report only (mg/L) | all year | 003 |
| Storm water flow | daily maximum | report only (MGD) | all year | 003 |
Cited limits by parameter: Missouri's rules and the federal ones.
Same industry: the 12 Stone, Clay, Glass and Concrete Products permits in Missouri.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/MO0000710 · MCP: https://passage-data.com/mcp